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Gironde sinne,- on

iMPRoveMEn-r i .To all whom/git 'may concer-n.:

, g Be it known that I., GEORGE Nimmo, sey City, in the county of letvJersey,v here invented, made. enti applied to use n certsin new midnseini improvement in Molding Crucibles and Pots; ont! i. do herevby dechire vthe following null, clear,

ot' Jerto-be n 't and exact description of the said invention, reference bein 1 had to the annexed drawings, i nin-king part, oi' this specification, wherein- Figure 'l is n plan View of my ninchine for `molding,` crncibles, and'vFig. :tsection elevation ot the sinne. l

Similar marks oi' refere 1pz-tris;

` C-rnciblcs vhave ',heretoibre been nnnielin n. mold by n pressing-Linstrninent,,as may be'seen v by reference to Letters Pntentgrnntcd Goto- V ber 26,'1S52,to John Aitrill.

Diii'iculty has heretofore been experienced in removing these crnciblcs from the mold in con sequence ofthe adhesive nature of the black lend compound or mixture employed for sncix crncibles. The :l1-mount oi' required to make the mixture sniiiciently pinstic causes the motorini frequently to crack und breakin shrinking :is it. dries.

The nature oi' my seid invention consists in the manufacture ot crnciblesi n n plnster mold, which gives shape to the pot externally and absorbs the moisture iroin the pot, causing it to dry uniformly end at. the santo time shrink ntvnv from .the mold, prevent ing;- the nir noting on the outside oi" the pot until n-i'teif the moist-- nre has been mostly absorbed, and prevents the pot from splitting or cracking from unequal .contraction in drying'. I mount my plaster mold in n. revolving chuck and employ e rib attached to n lever for spreading the plastic crncible material on the inside oi' the mold and nt: the same time hnrdening,consoliilnting, and polishing the crncible on tbe inside by ineens oi' said rib.

in thedrawings, a. is a bed carin-'ing the vci-, tical spindle b, on the upper end of which is the hollow' chuck c, into vwhich the plaster mold d fits, and these parts are revolved by abeltt-o afivheei, e, and crnnkf, (see Fig. 1,) or mpetentmeans. Nenrthechucii nce denote thefsmnc water, also, that is'j Jensen or'rv, .nnni'nsn n McLean-e cnccie'eesi .specificati-ion forming-port..ci Letters Patent No. 1&9, f, d

Hudson and State of i of sied August l, 1555..

c is en' upright freine, g, with rollers 7i 7i, over which the chain or rope'. posses, on one end which is the. counter-weight Yr, and on the other thcicver I, having :t handle, in., abone end and cnrryin tbe rib n. This by the upright; freine g, and when nooit: use is drawn np by the weight '7a. The crueiblo motorini is-plnced in the plaster mold d and portie-lily spread by hond or by a conical mulier. The brick end of the lever lis then brought benenth the stop or i'ulcrnni o and pressen down nntil `the lever taires n stop, p. 'The ril on the lover smooths, com presses, hordens and poiis'ncs the interior oi' the mold, forming. n perfect crucible, possessing great strengt :ind beauty. At, the saine time there grec nn'iiorniity in the erncibles made in this man ner. The crucible and niold :irel to be lifter oli' the cinici: and another molti introduced iy the chuck ind theoperntion repented.

The Crucible and incidere set aside. Villiethe plaster ot' thc mold hns nbsorbedthe moisi nre from the crncible and the Crucible has coir ri-acted n-wny from the incid and become su ficiently dry to be exposed to the nir wither. risk of cracking', the orncible is to be remove nud dried in any nsnni ninnner, and may be bilidad or. burned. 4

Whetclaim nml desire Patentisfi. M nnntnctn rin g crncibles in nplnster mold, in the. nntnner ond for the purposes specitieil.

Lever land rib u, applied specified to ibrnrihe interior of a Crucible contained ,hin a revolving mold, as set, forth.

The combination ot.' the revolving chuck o, plaster nioldd, lever l, and rib n, as und i: the purposes speciiic'd.

Mounting the'leverll and rib nin therni; g in the. ninnner speciiied, in combination Wi the conntt-npoise lc, fulcrnxn o, and stop jp, i' ldetermining'the size of the interior of the ci cible, :is speciiied.

In witness whereof I have hereunto setr. signature this 20th day of June, A. D. 1865. GEORGE NIMMO.

to secure by Letters lever?. is guided i in the mannerA 

